266 
GASTEROPODA OF THE INFERIOR OOLITE. 
Oolite, I lately proceeded to examine the type at the Jermyn Street Museum. 
This was the only specimen in the Great Oolite Collection, and a careful 
examination showed that this was most probably from the Pisolite of Longfords, 
and consequently an Inferior Oolite specimen. There is no evidence to my 
knowledge that Euspira canaliculata ever occurs in the Great Oolite of this 
country, though a micromorph, Euspira subcaniculata, Morris and Lycett, is 
occasionally found in that series. 
Description : 
Spiral angle .... 96°. 
Height of body-whorl to entire shell . . 74 : 100. 
Length about . , . .30 mm. 
The following is the authors’ diagnosis : “ Shell oblong, spire but little 
elevated, apex acute, whorls angulated, the angles acute, the upper portion of the 
whorls deeply channeled, their lower portions rather convex, the last whorl oblique, 
its base attenuated ; aperture elliptical, the umbilical fissure narrow. Several 
obscure encircling lines may be traced upon the middle of the last whorl.” 
Relations and Distribution. — Since this species is put forwards by the authors 
in the front rank of the sub-genus Euspira, it becomes necessary to study it with 
special attention, and all the more so as there is every reason to believe that it is 
an exclusively Inferior Oolite species. There can be little doubt that Natica 
{Euspira) canaliculata is first cousin to the typical form of Natica adducta, from 
which it mainly differs in the greater width of the sutural ledge, or “ meplat.” 
There are, in fact, forms in the Dogger which seem to connect the two. The 
group to which Natica Pelops, Natica Oppelensis, Natica adducta, and Natica 
canaliculata belong have the following elements in common, viz. a spiral angle, ; 
which is a right angle or slightly in excess, a body-whorl about seven-tenths the , 
total height, and very square-shouldered whorls. 
Specimens with a sutural ledge almost as broad as in the type occur in the i 
Dogger, but the species is most abundant and most typically developed in certain | 
beds of the Inferior Oolite in Gloucestershire. 
202. Natioa oincta, Phillips, 1829. Plate XX, fig. 17 ; Plate XXI, figs. 3 and 4. 
1829 and 1835. Natica cincta, Phil. Geol. Yorks., pt. 1, pi. iv, fig. 9, p. 101. j 
1853. — Leckhamptonensis, Lycett. Proc. Cottesw. Nat. Club, vol. i, 
p. 77. 
1854. — CINCTA, Phil. = Natica Leckhamptonensis, Lycett. Morr. Cat., 
p. 262. 
1882. — — Phil. Hudleston, Geol. Mag., dec. 2, vol. ix, p, 197, pi. V, j 
fig. 4. ' 
